Annual report [Section 13 and 15(d), not S-K Item 405]

REVENUE (Details)

v3.25.4
REVENUE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Operating revenue $ 6,074.5 $ 5,681.1 $ 5,265.2
Change in operating revenue 393.4 $ 415.9  
Change in operating revenue (as a percent)   7.00% 8.00%
Canada      
Disaggregation of Revenue [Line Items]      
Operating revenue 271.4 $ 264.9 $ 259.6
Total Workforce Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 2,582.3 2,433.8 $ 2,315.8
Change in operating revenue 148.5 $ 118.0  
Change in operating revenue (as a percent)   6.00% 5.00%
Total Workforce Solutions | Verification Services      
Disaggregation of Revenue [Line Items]      
Operating revenue 2,179.8 $ 2,021.9 $ 1,846.2
Change in operating revenue 157.9 $ 175.7  
Change in operating revenue (as a percent)   8.00% 10.00%
Total Workforce Solutions | Employer Services      
Disaggregation of Revenue [Line Items]      
Operating revenue 402.5 $ 411.9 $ 469.6
Change in operating revenue (9.4) $ (57.7)  
Change in operating revenue (as a percent)   (2.00%) (12.00%)
Total U.S. Information Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 2,078.5 $ 1,893.0 $ 1,720.4
Change in operating revenue 185.5 $ 172.6  
Change in operating revenue (as a percent)   10.00% 10.00%
Total U.S. Information Solutions | Online Information Solutions      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,821.4 $ 1,650.6 $ 1,488.9
Change in operating revenue 170.8 $ 161.7  
Change in operating revenue (as a percent)   10.00% 11.00%
Total U.S. Information Solutions | Financial Marketing Services      
Disaggregation of Revenue [Line Items]      
Operating revenue 257.1 $ 242.4 $ 231.5
Change in operating revenue 14.7 $ 10.9  
Change in operating revenue (as a percent)   6.00% 5.00%
Total International      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,413.7 $ 1,354.3 $ 1,229.0
Change in operating revenue 59.4 $ 125.3  
Change in operating revenue (as a percent)   4.00% 10.00%
Total International | Latin America      
Disaggregation of Revenue [Line Items]      
Operating revenue 403.4 $ 384.9 $ 290.9
Change in operating revenue 18.5 $ 94.0  
Change in operating revenue (as a percent)   5.00% 32.00%
Total International | Europe      
Disaggregation of Revenue [Line Items]      
Operating revenue 396.7 $ 369.2 $ 333.2
Change in operating revenue 27.5 $ 36.0  
Change in operating revenue (as a percent)   7.00% 11.00%
Total International | Asia Pacific      
Disaggregation of Revenue [Line Items]      
Operating revenue 342.3 $ 335.4 $ 345.3
Change in operating revenue 6.9 $ (9.9)  
Change in operating revenue (as a percent)   2.00% (3.00%)
Total International | Canada      
Disaggregation of Revenue [Line Items]      
Operating revenue 271.3 $ 264.8 $ 259.6
Change in operating revenue $ 6.5 $ 5.2  
Change in operating revenue (as a percent)   2.00% 2.00%